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  <h1>NAME</h1>

  <p><b><code>bdep-argument-grouping</code></b> &#8211; argument grouping facility</p>
  <h1>SYNOPSIS</h1>

  <p class="code"><code><b>bdep</b> <b>{</b> <i>options</i> <b>}+</b>
  <i>argument</i> <b>+{</b> <i>options</i> <b>}</b></code></p>

  <h1>DESCRIPTION</h1>

  <p>For certain commands certain options and command line variables can be
  grouped to only apply to specific arguments. This help topic describes the
  argument grouping facility used for this purpose.</p>

  <p>Groups can be specified before (leading) and/or after (trailing) the
  argument they apply to. A leading group starts with '<code><b>{</b></code>'
  and ends with '<code><b>}+</b></code>' while a trailing group starts with
  '<code><b>+{</b></code>' and ends with '<code><b>}</b></code>'. For
  example:</p>

  <pre>{ --foo --bar }+ arg   # 'arg' with '--foo' '--bar'
arg +{ fox=1 baz=2 }   # 'arg' with 'fox=1' 'baz=2'</pre>

  <p>Multiple leading and/or trailing groups can be specified for the same
  argument. For example:</p>

  <pre>{ -f }+ { -b }+ arg +{ f=1 } +{ b=2 } # 'arg' with '-f' 'b' 'f=1' 'b=2'</pre>

  <p>The group applies to a single argument only unless multiple arguments are
  themselves grouped with '<code><b>{</b></code>' and '<code><b>}</b></code>'.
  For example:</p>

  <pre>{ --foo }+ arg1  arg2 +{ --bar }      # 'arg1' with '--foo'
                                      # 'arg2' with '--bar'

{ --foo }+ { arg1  arg2 } +{ --bar }  # 'arg1' with '--foo' '--bar'
                                      # 'arg2' with '--foo' '--bar'</pre>

  <p>The group separators ('<code><b>{</b></code>', '<code><b>}+'</b></code>,
  etc) must be separate command line arguments. In particular, they must not
  be adjacent either to the arguments inside the group nor to the argument
  they apply to. All such cases will be treated as ordinary arguments. For
  example:</p>

  <pre>{--foo}+ arg   # '{--foo}+' ...
arg+{ --foo }  # 'arg+{' ...</pre>

  <p>If one of the group separators needs to be specified as an argument
  verbatim, then it must be escaped with '<code><b>\</b></code>'. For
  example:</p>

  <pre>}             # error: unexpected group separator
}x            # '}x'
\}            # '}'
{ \}+ }+ arg  # 'arg' with '}+'</pre>

  <h1>BUGS</h1>

  <p>Send bug reports to the
  <a href="mailto:users@build2.org">users@build2.org</a> mailing list.</p>

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